Chapter 1 9 Content Service Steering; Overview - Cisco ASR 5500 Administration Manual

Content Service Steering
This chapter provides information on configuring Content Service Steering (CSS). The product administration
guides provide examples and procedures for configuration of basic services on the system. You should select
the configuration example that best meets your service model, and configure the required elements for that
model as described in the respective product administration guide, before using the procedures described
below.
Important
This chapter contains the following topics:
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Overview

Content Server Selection (CSS) is a StarOS function that defines how traffic will be handled based on the
"content" of the data presented by a mobile subscriber (or to a mobile subscriber). CSS is a broad term that
includes features such as load balancing, NAT, HTTP redirection, and DNS redirection.
The content server (services) can be either external to the platform or integrated inside the platform.
CSS uses Access Control Lists (ACLs) to redirect subscriber traffic flows. ACLs control the flow of packets
into and out of the system. ACLs consist of "rules" (ACL rules) or filters that control the action taken on
packets matching the filter criteria.
ACLs are configurable on a per-context basis and applies to a subscriber through either a subscriber profile
(or an APN profile in the destination context. For additional information, refer to the Access Control Lists
chapter.
Internal CSS is a generic feature, if an ECSv2 license is installed on your system, internal CSS can be
enabled. A separate license is not required to enable internal CSS. Contact your local Cisco account
representative for information on how to obtain a license.
Overview, page 255
Configuring Internal Content Service Steering, page 256
C H A P T E R
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